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AGREEMENTS AND RELATED PARTY TRANSACTIONS (Details) - USD ($)					3 Months Ended		9 Months Ended
	Aug. 02, 2022	Feb. 25, 2022	Dec. 23, 2020	Aug. 02, 2018	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Management fee expense					$ 8,267,000	$ 5,274,000	$ 21,520,000	$ 14,094,000
Base management fees payable					8,267,000		8,267,000		$ 5,422,000
Incentive fee expense					1,825,000	4,443,000	6,579,000	10,675,000
Incentive management fees payable					1,825,000		1,825,000		4,067,000
Administrative fees payable					900,000	800,000	2,700,000	1,800,000
Administrative fees payable					895,000		$ 895,000		$ 750,000
Original Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee, percent	1.375%
Incentive fee, percent				2.00%
Amended and Restated Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee, percent			1.25%
New Barings BDC Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent		2.0625%
Original Advisory Agreement - Annualized Incentive Fee Rate | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee				8.00%
New Barings BDC Advisory Agreement - Annualized Incentive Fee Rate | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee		8.25%
Investment Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee							1.25%
Investment Management Agreement - Incentive Rate, Quarterly Hurdle Rate | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				2.0625%
Investment Management Agreement - Incentive Rate, Annualized Hurdle Rate | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				8.25%
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				100.00%
Investment Management Agreement - Incentive Rate, Quarterly Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				2.57813%
Investment Management Agreement - Incentive Rate, Annual Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				10.3125%
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Exceeds Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				20.00%
Pre-Incentive Fee Net Investment Income For Trailing Twelve Quarters Exceeds Catch-Up Amount | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				20.00%
Investment Management Agreement - Incentive Rate, Cumulative Pre-Incentive Fee Net Return | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				20.00%
Investment Management Agreement - Incentive Rate, Realized Capital Gains
Related Party Transaction [Line Items]
Incentive fee expense					0		$ 0
Investment Management Agreement - Incentive Rate, Realized Capital Gains | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				20.00%
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income
Related Party Transaction [Line Items]
Incentive fee expense					$ 1,800,000	$ 4,400,000	$ 6,600,000	$ 10,700,000
MVC Credit Support Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction amount (up to)			$ 23,000,000
Related party transaction, term			10 years
Sierra Credit Support Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction amount (up to)		$ 100,000,000
Related party transaction, term		10 years

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